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R. C. M. HASTINGS.

AUTOMATIC SELECTWE TELEPHONE SYSTEM. APPLICATION FILED MAR. :0. newam'zwzp APR. 2: :9

1,334,452. Patented Mal-L 23; 1920.

PE h Q] is n i n gg M IWM M h +1 I l N Q Q Q e I g? N R l :1 ilnucuhwwihl ca wn R. C. M. HASTINGS- AUTOMATiC SELECTIVE TELEPHONE SYSTEM.APPUCATHIR FILED HR. '0, '95. 1,334,452.

RENEWED APR. 23,1919

Patented Mar. 23, 1920.

R. C. M. HASTINGS.

AUTOMATC SELECTIVE TELEPHONE SYSTEM.

APPLICATION FILED MAR. 10. l9l5. 1,334,452.

RENEWED APR. 23, I9l9.

Q 2 7! IE 3L L r hm m d5 9 n 6 t a Man, djlijfaa Hncmco R. c. M.HASTINGS. AUTOMATIC SEL ECTfVE TELEPHONE SYSTEM.

ICATION FILED MAR. I0, I915x RENEWED APB. 23.19!!!- Patented Mar. 23,1920.

9 SHEETS-SIRE] 4.

Ram CM 17ml N Um ihluznu) R. c. M. HASTINGS. AUTOMATIC SELECTIVETELEPHONE SYSTEM.

APPLICATION HLED MAR. I0, l9l5. RENEWED APR. 23, I9|9. 1,334,452.

Patented Mar. 23, 1920.

@ g g EzbcnCLM/Ymg' .7

R, (3. M HASTINGS, AUTOMAHC SELECTIVE TELEPHONE SYSTEM. MFLICATIUN HLEUMAR. Ht

IikNEWED APR. 23. I919.

Patented Mar. 23, 1920.

9 SHEEIS-SHEET 6.

R. C. M. HASTINGS. AUTOMATIC SELECTIVE TELEPHONE SYSTEM. APPLICATION menMAR, 10. ms. RENEWED APR. 23, 1919. 1,334,452

Patented Mar. 28, 1920.

9 SHEEIS SHHLT I.

3n ucn for Man A MUS SEEECTIVE TELEPHONE SYSTEM. APPLIC; 1,334,45

:HLED MAR. 2%, Hi5 RENILWED APR 23, 1919.

Patented Mar. 23, 1920.

E) tiHLEIS-SHLLI 9 nnuloz UNITED STATES PATENT OFFICE.

RUBEN C. M. HASTINGS, OF COLUMBUS, QHIG. ASSIGNOR TO THE INTERNATIONALTELEPHONE COMPANY. 0F COLUMBUS, OHIO, A CORPORATION OF OHIO.

AUTOMATIC SELECTIVE TELEPHONE SYSTEM.

Specification of Letters Patent.

Patented Mar. 23, 1920.

Application filed March 10, 1915, Serial No. 13,392. easewetl April 23,1319. Serial No. 292,233.

1' b all whom it may concern Be it known that I, RUBEN C. M. I'IAST mos,a citizen of the United States, residing at Columbus, in the county ofFranklin and State of Ohio, have invented certain new and usefulImprovements in Automatic Selective Telephone Systems, of which the following is a specification, reference being bad therein to theaccompanying drawing.

'lhe present invention relates to improve ments in automatic selectivetelephone systems, and more particularly to systems cinploying partyline circuits, one object of the present invention being the provisionof a selective system of telephony, in which pcculiar mechanismsaredisposed in all of the substation instruments and form a portion ofeach instrument thereof and control the shunting oi the talking circuitwhereby such instrument may be shunted from the main line, and alsowhereby the instrument desired may be selected and signaled through thecall-up alarm, regardless of the position of the receiver in such calledinstrument, there being provided automatic shunting, seletting andsignaling means or mechanisms to control the various elen'ientsemployed, the operation of which isentirely under the supervision and.control of the operator at the exchange station through a selecting ormaster key and as set forth in the system disclosed in my reissued U. S.Patent. No. 13,989, dated Sept. 28, 1.915. the selecting or master keyin present instance being 501 what similar to the key set forth in myformer U. S. Patent No. 1,061,286, dated May 13, i913. and alsocontaining some of the features of my former U. S. Patent No. 1,061.28?dated May 13, 19l3.

A further object of the present invention, is the provision of aselecting disk or corn trollcr embodying" somewhat similar fear turcs tothat shown in my former U. 53. Petent No. Lilli-Emil, dated May :20,1913:, the

present disk or controller. however, being (tillSi-iliLtQi'l andarranged to control the shunting switch and other switches that arecon-trolled by such shunting switch to permit of the selecting: andsignaling oi" the called substation whether its receiver is upon or oilthe hook, kind to also control such ins '-ir'u:n m regardless of theposition of the limiii. M. is fif'ii iili-(l Whom-i i, i has nth-nupt alto steal a conversation he is debarred from calling any substationexcept the exchange station, but can 'be called by the exchange station.thus making it possible, though such debarred subscriber is so affected,that a calling subscriber who desires to converse with the penalizedsubscriber may be connected for conversation with the penalizedsubstation. It will also be further noted that olthough s person hasleft the receiver off of the hook and afterward decides to raise andlower the hook, the person having use of the circuit will not bedisturbed by the clicking noise occasioned in practical use at the presout time.

A still further object of the present inveir tion is the provision of anovel form of automatic shunting; or lock-out device, in which thecontrol of the various switches or contacts is placed directly under theinfluence of a spring and clectromagnetically actuated mechanism, whichin turn is synchronously operated through the selecting key at theexchange station.

A stili further object of the invention is" the provision of a visualnon-audihle busy signal adapted to be displayed at the substationinstruments to notify at a glance Whether or not the line is incondition to signal the exchange station, the same being preferably aluv. voltage lamp circuit hava switch controlled by the substationinrnrni it. y

A still further object of this invention the provision. of anautomatically actuated synchronize? at each substation instrument, allythe controller is assured a zero or in lal position should anyinstrument get out of step, and whereby the exchange ope!" ator maybring: such instrument into syn-- chronisiu. by the manipulation of theselecting key.

A still :er and important object of this system the provision of a"speech recording aiperatus. by means of which in the event 0 asubscriber being absent, the

receiver may be left from the hook or other lllt'itns may be grow iilcdso that the exchange operator in connecting the instrument of theeiisrni' subscriber with a calling sol .upon the return of the absentsubscriber and whereby a speech recording and mprodicing apparatus maybe connected at l the exchange station to receive messages of lcharacter iron! the various substations. the present instrinnent thereis also l.illl limdied with'slight modifications the callalarm mechanismas set forth in my cogzndin up iication filed August 20, 1913, ml 0.85,818, while some of the 'pres vention;

In the accompanying drawings Figure 1 is a diagrammatic view showing thecircuits involved in signaling the exchan station by a substation andinclud- 80 e synchronizer.

L 215 a similar view showing the circuits inrolved in the talking ooration.

Fi 3 iso. similar view 0? the circuits invo ved in selecting and callinga substaas tiohn Fig. 4 is a similar view showing the circuitsflinvolvedin the general call and busy s1 ig. 5 is a complete diagrammatic view Yof the present system equlpped with local battery and exchange stationenergized signaling mechanism. Fig. 6 is a similar view to Fig. 5showing the system operated from a common battery at the exchangestation.

Fig. 7 is a viewin elevation of the lockout mechanism carried at thesubstation.

Fig. 8 is a top plan view thereof. Fig. 9 is a detail view on anenlarged scale of the receiver hook and the switches adjacent thereto.

Fig. 10 is a horizontal section above the.

disk 36, showing the means for insuring the normal position thereof. 56Figs. 11 through 17 inclusive are diagrams of the periphery of thecontroller or isk and the relation of the paths of the 0perating pin ofthe shunt switch under various conditions. 1 Figs. 18 through 21inclusive are detail views of the various positions of the disk andswitches. a a 22 and 23 are detail views of the selecting key and theswitches controlled en there y In order to more fully understand thepresent lllltllltlflll, the dctznled description of the controlliurdisks 36 and and their operation, an the shunt switches or 601i? tacts38 and 39 will set forth. The disk 'H 36, which is tlieinssn diskion-controlling the shunt switch and the other switches therefrom, isprovided with three ridges-a. b, and c, and two grooves 54 and 58;thisdisk and the switch SS -3% constitutes the shunting means to shunt thesubstation S from the line lip-5L" when necessary, being operated fromthe exchange through the instrumentality of the selecting key K at theexchange station E and providing a means so for automatically shuntingfrom the line, the uncalled substations and connecting for communicationthe called substation with. the calling substation for a private ornoninterfering conversation, the operation of 35 the disk 36, as willpresently appear, being completely and solely under the control oi theselect ng key from the exchange station.

For the sake of clcnrness, the description will follow the operation instartin with the asking by a calling substation of the exchange station,and the connection by the exchange of 3. called substation. To thereforeclearly describe the operation, we will presuppose that the subscriberat substation No. 1 is calling for subscriber at substation No. 5 on thesame arty line, all of the disks 36 at this time being at what is termedzero position, (Figs. 11 three d1 18), with all the pins 38' carried byt cico shunt contacts 3M9 disposed at positions and as clearlvillustrated in Fig. ll, of the, dia ruins of the peripheries of the diskT us the ridges b at such point will en-- gage the pin 38 and hold theshunt comtacts downwardly against the tension of the spring ell, thedetailed construction, and an rangement of which will prcscnlly a Theshunt contacts 38-39 at this seen u in all substations are separated andopen 5. therefore all substations are connected the line forcommunication with tie.

change station E.

In the diagram as shown in Figs. 1,, I :l 6, the receiver R, is removedfrom the 2' 25, to permit the hook to rise and co the contact 61. sothat the signal 9 at all change station is energized and the earl;- i eoperator is notified that a substation is calling. As the answering andcall-512;, plugs 1----:3, are not in place and though lze ontact of thesocket therewith is not made at this timefthcrc is no dungci' oi thcclcctro magnet 29 being short circuiicd. This is effooted through thefollowin circuit, in- 125.

wit:-thc battery B, theconductor 10, the contact 205 the contact 210',the conductor 10, the signal 9i the conductor 8, the cgntact finger 152of the socket J to the anvil 153, the conductor 105, the wnteets 11 and12,

conductor 7, the electromagnet 29, the conductors 5 and 6, the receiverhook 25', the contact 61, the conductors 46 and 16 the choke orimpedance coil 0 the groun s g( and g, the conductor 10'", the contacts212 and 213, and the conductor 10".

The exchange operator then inserts 'the plu 1 in the socket J, and thusthe exchange station is connected to the line for responding to thecalling substation, who asks to be connected to a certain substation.

The selecting key, as described in my U. S. Patent No. 1,061,286, abovereferred to, is manipulated astherein set forth to selectthe instrumentNo. 5 and thus automatically, this action as will presently appear,causes the closure of a circuit to t e call-up alarm 81 in substationNo. 5 and consequently the Signaling of such substation, all disks 36 inthe various substations being actuated by the step-by-step' motionimparted to the shaft 35 of the disks 36 and 37 through theinstrumentality of the electro-magnet 29 which is connected at all timesin circuit with the line LL, the circuit of which will be described infull later on. Thus all of the disks 36 in every substation are causedto automatically be moved five positions, all of the ins 38, except theone calling, substation lo. 1, are caused to pass through the respectivespaces 55 and consequently enter the respective groove 58,,this beingdue to the fact that the receivers were upon the hooks and the springs41' were permitted to elevate the shunt contacts 38-39, unhindered fromthe electrical attraction of the magnet 47 upon the armature 41, whichis selection of substation No. 5, the

connected to and forms a part of the swingingly mounted contacts 38-39.At this time, except at substation No. 1, the circuit to the magnet 47was opened at contact 61, and thus as before described, spring -11 waspermitted to cause the pin 38' to pass through the slot 55 abovereferred to.

In order to prevent the calling substation No. 1 from being shunted bythe action of the disk 36, in such substation when the disk 36 wasrotated, simultaneously with the pin 38' is held from entering the slot55 (Fig. 16). It will be observed that the receiver being 16E the hookin substation No. 1 causes the closure of circuit at receiver book 25and contact 61, and that such circuit, to be presently set forth, causesthe energization of the electromagnet 47. This attracts the armature 41and moves the contacts 38.39

against the action of the spring 41, to cause the pin 38 to be reventedfrom entering the slot 55, (Fig. 6?, thus causing the same to be heldbelow the ridge 5 as long as properly operated. Thus it will be seenthat the calling substation can be placed in commumcatgnn with any ofthe substations conductors -12 and 43 connected across the receiver R,as illustrated in dash line, Fig. 2, and also producin the same resultas in my former system reissued Letters Patent No. 13,989. This thecalling substation will have its disk 36 in such position that therelease of the selecting key K will permit of the return of the disk 36to normal or zero position, or as shown in Fig. 11.

.T he zero or normal. position is the position below the projection a,that is on? step in advance of the substation No. 1 and five steps inadvance of the substation No. 5, and so on as shown in Fig. 11. It willtherefore be noted that the wedge-shaped projection 38, which is placedupon and carried by the disk 36, (which in the present instance is thecalled substation No. 5) is to open the shunt switch 3839 by the pin 38,and thus permit of the proper connection and signaling of the substationNo. '5 for connection with the substation No. 1.

Under normal conditions, when the conversation between substations Nos.1 and 5, is at an end, the receivers in both will be placed upon thehook and exchange operator will then remove the plug 1 from the socketJ, and thus as set forth in my Patent No. 1,061,286 permit the automaticreturn of the carriage of the selecting key, and the operation andreturning of all of the disks 36 to the position as shown in Fig. 11,with all parties in normal or zero position and in condition whereby anyone of the substatious may signal the exchange station.

Let us assume that the party at substation No. after the completion ofthe conversation left the receiver oil of the hook 25, but that theparty at substation No. I returned. the receiver to the hook, theactuation of the disk 36 due to the automatic return of the selectingkey to zero position would cause the pin 38 to more under the ridge b atthe slot 60, due to the fact that when the receiver was laced upon thehook, the contact 77 was closed by receiver hook 25 and consequently thecircuit to the clcctromagnet 17 was closed when the pin 37 passed thecon tact 74 at the position No. 11, assuming there to be 12 positions ofthe key, upon the calling substation, or adjacent the slot 60, and thusthe electromagnet 47 was energized and the armature 41 attracted tocause the shunt switch 38-39 to follow the dotted position,

change station. 1 3 0 on the same line the second plug is unnecessary),and contacts 104, 152 and 153' are separated from the anvil,|153 at thesocket J, and thus all of the circuits to be controlled are made readyfor the manipulation of the selecting key. The operation of theselecting key throws impulses upon the line from the battery 23 theelectromagnets 29 in every substation, thus imparting a step-by-stepmovement to the shaft and the disks 36 and 37. This action will causethe proper manipulation of the shunt switches 3839, and the othercontacts 44, 45, 74, -7l, and 85-86, so that the called substation willbe connected to the line with the switch 38-39 open, while the uncalledsubstations will have the shunt switch 38-39 held closed, and thus havetheir receivers shunted from the line, and there held until the selectinkey K at the exchangestation has been re eased, due to the removal ofthe plug from the socket, and the return of the selecting key to zero ornormal position. During the return of the selecting key, the shaits inall of the substation. have a step-by-step movement imparted (1 them aswhen the key was moved to selecting position, and all switches 38-4-59are simultaneously placed.in shunt open position, with all of themconnected to the line. l l

The manipulation of the selecting key after the calling plug 2 isinserted in the socket J will cause the throwing of successive impulsesupon the line from the battery 23 and consequently afl'eot theelectromagnets 29, as each one of the electromagnets isconnccted to theline and in series through the conductors 5 and 7. At the selecting key,in conjunction with the contacts 11--12, are the contacts 2021, whichare operated by the selecting key as before stated, the automaticopening and closing of the same connecting and disconnectin the battery23 to the line LL' and thus energizing all of the elcctromagnets 29through the following circuit, towit:

'lhe contacts 2021, (sec heavy lines Fig. 3), the conductor 22, thebattery 23, the choke or impedance coil 0", the conductors 24, 24 and Lto the other side of the line ii, the conductor 7, the electromagnct 29,of all substations, the conductor 5, the conductor 15, the contact 14 ofthe jack J, tip of to energize all of the plug 1, the conductor 3, thechoke coil 0', the conductor 4, the ringing and answering key K, theconductor 105, and contact 20.

he choke coil 0 is so situated as to bridge the circuit through eitherjack plug acting as a short circuit to each plug toward the directcurrent from the battery 23, but impervious to the hi h frequencyimpulses of the secondary talking, current, and also allowing it anunimpeded path from the plpg 1 to the plug 2, or to the listening keyThe electromagnet 29 is a" lifting electromagnet constructed with aniron shield so as to be impervious to a secondary talking current ofhigh frequency impulses, but to be pervious to the direct current fromthe battery 23. j

Whether the receiver hook 25' in its lowermost position, with thereceiver R h ereupon, or not, the circuit with the line electromagnet 29an the conductor 7.

Vhen the variouscelectr'omagnets 29 in all of the substations aresimultaneously energized, the armatures 30 are attracted against theaction of their respective springs 30, and operates the respectiveoperating and arresting pawls 31-432, which in turn actuates therespective operatin and arrestin ratchets 33 and 34, keye upon therotate le shaft 35. This shaft in the resent instance is carried by thebase B (l igs. 7 and 8), which carries the majority of the substationselectin and lock=out mechanism and is adapted to placed in any standardtelephone desk set or well set. Thus the present device is readilyinstalled and positioned in place and due to the spring 41', and theelectr magnet 47, the present mech anism may be operated regardless ofthe position in the instrument or set, this peculiar arrangementpermitting the same to be placed at any angle and be carried bodily onthe door of a box set.

When the shaft 35 has the stcp-by-step ac-' tion imparted thereto, thedisks 36 and 37 are operated. and the various or desired operationscontrolled by said disks are carried out.

As before described, the shunt controlling contacts 38 and 39 areoperated by the periphcral portion of the disk 36, the pin 38 thereofbeing adapted to follow the dotted positions, as illustrated in Figs. 11through 17, and thus consequently control the shunt contacts 38 and 39according to the position of the receiver hook 25 in the substations.

Disposed in the path to be engaged by the pin 37 of the disk 37, are twocontacts 44 and 74 (Fig. 3;) the contact 4-1 having lcd therefrom, aconductor 46 connected to the contact (ll, (the receiver book beingdisposed in make the contact when elevated), and lhuz: complcto thecircuit through the conductors 80 and 66, the battery 65, the

is complete through the conductor 5, the,

hen suchp'alling substation has completed the conversat with the calledsubstation and the receive has been hook and the selecting key I at theexchange station has been released by the removal of y the 13111 fromthe jack, as before described,

part cause the pin 38' the dis 36 and 37 will be returned to initial orzero position by the rotation of the shafts 35 in all of thesubstations. This same condition is employed to move the pin 38 into thegroove 58, through the slot 60, when a party using the instrument hasneglected to lace the receiver upon the hook at the comp etion of theconversation, the spring 41' at this time ushing the pin 38' from thegroove 54 to t e ove 58, after the exchange operator has isconnected thecalling substation by the return of the carria of the selecting key tonormal or zero position.

The contacts 85 and 8-6 are provided as a means for oonnectin thecall-up alarm 81 at the substation, so t at when the disk 36 is operatedand causes the closure of thecontacts 85-86, the call alarm 81 will u;energized through the following circuit, towit the contacts 85-86, theconductor 82, the call-up alarm 81, the conductor 66, the battery 65,and the conductors 51 and 51'. Thus the call-up alarm will be energizedand will remain energized until the receiver is removed from the hook,or the hook is vibrated, to open the callup alarm circuit at contacts85-86 by the removal of the pin 38 from .the tooth or depression 38 andinto the groove 54;. The call-up alarm in this instance, as hereinnoted, is controlled by the local battery, or a battery at thesubstation and is so constructed as to prevent the operation thereofcaused by the engage ment of the tooth or depression 38 in the uncalledsubstations when the pin 38' is adjacent such point.

Should the subscriber at the called sub- -station for any reason haveleft the receiver R ofi of the hook, the call-alarm will be operatedregardless oi the position of the book. When the disk 36 is beingrotated by the manipulation of the selecting key, and just as the pin38' reaches a position approximately a zero position, the spring 41',not being opposed by the electromagnet 47 will i to pass through theslot 60. was clearly illustrated in Fig. 13, so that the next time thesubstation is called by the exchange station, the pin 38' owing to the ynot placing the receiver upon the hook. will be caused to travel inthegroove 58. thereby placing it in a position to he engaged by he tooth ordepression 38. Thus it will placed upon the be evident that the alarm 81Will'continue to ring similarly to the before mentioned ringing when thereceiver was upon the hook, and that means are provided tofloalise theoperation of the call-up alarm regardless of the position of thereceiver hook, (Case E). l

The contacts 8586 are operated by the contact 38 of the shuntcontroller, so that when the shunt contacts 38-39 are closed, thecontacts v85-86 are open. By this arrangement the uncalled substationswill be shunted from the line and will also have the circuitcont-rolling the call-up alarm open, so that such call-up alarm circuitcannot be operated until the shunt contacts 38-39 are opened. I

When lhe receiver hook 25' is vibrated to cause the call-up alarm =81 tocease ringing, it does so by means of the energization of theoloctromagnet 4?,nvhich attracts the armature 41 and moves the pin 38'from the tooth or depression 38 into the'grnove 54. This is accomplishedby means of a contact 25 carried by the receiver hook '25 (Fig. 9), orthe book '25, and a contact 151, which is disposed in a mid position tobe engaged by the hook during its movement but not at either extremeposition. This closure causes the energization of the electromagnet 47,which attracts its armature 41 and swings the pin 38 transversely of thedisk 36 out of engagement with the depression 38 and into the groove54:, which permits the opening of the contact 85-86 and the cali-upalarm circuit. The depresatcd for this function through the 'lollowinncircuit. to-\vit:--the eloctroinagnet 47,

the conductors 5i and 51. the luittery 65, the conductors 66 and 80, thereceiver book 25, or its contact 25, the contact 151,, and theconductors 53' and 53.

\Vheu the receiver has been left from the hook. the pin 38' is pushed tothe groove 58 by the sprim; ll. as the selecting key K returns the disks36 to zero position.

Mounted upon the disk 36 at zero position in the groove is the tooth60", which performs a function similar to the tooth 38, ringing thecall-up alarm at the substation whose receiver has been improperlyelevated and thus permittingthe pin 38 to be en- 'gaged by this pin 60.At the same time the drop, or signal 9 at the exchange station isenergized because the withdrawal of the plug from the'jack has causedthe closing of the di'op signal circuit at the contacts 152-453. Hencethe exchange operator again inserts the plug, and the substation in theabove condition will have its call-up alarm'enen its trolled in turn bya direct currcntiiowing between the ground and the line and rerorsihleat: the exchange station. This current is supplied by the dropcontrolling hat-- tvr v l5 llfigs. l, 5 nd ti) which normally uppliesits (a'Irre-nl from the line L through the conductors 80. I36 and 225 tothe relay 2*. thence lrv \\'a of the conductor to the ground g. Therelay, as before stated, is polarized, and does not respond to this normally flowing current. To operate the relay therefore and consequentlythe electromagnet 205, this current is reversed at the ex change stationby the key K, when it is released by the removal of the jack plug fromits socket. i

Positioned upon the frame of the key K (Figs. and 523). are the contacts209, 210, 211, and 213, operated simultaneously with the contacts101-402 hythe barrel 18. It will heohserred ihat this barrel is likethat of in) U. h. PatontNo. analysis, except for a raised portion orridge 21% at the rear end otthe barrel 18. a.nd a greater numher ofnotches upon the stepping portion 17. This harrel causes the contacts210-212 to .niore inward or outward to engage alter line of theelectroinagneis 39 and steps thorn until the respective pins 208 engagethe repective arms 307, the zero position of the disks, the disks beingheld in such position even though the key continues to ail'eot thesending of impulses out on. the line. During this time. from the.instant of the release of the kcy,thc contacts 210-212 engage thecontacts 209-21L respectively, assuming this position due to thecut-away portion 19 of the barrel 18. lVhen the carriage has returned tonornml position, however, the ridge or ring 214- lifts the contacts210--212 VfI'UIll this position to the normal position in engagementwith 211 and 213, respectively. Thus it is apparont that the arm 207after having adjusted their respective disks 36 will be permitted toreturn to their former position. out of the path of the posts 208,

doe to the deenergization of their respective electromagnets Q05non-ofi'ectivo to the reversed current. i 4

The general call is operated by means of a relay r connected hetivoenthe line and the ground. as shown. or hrirlged arross lho clerlronmgnet2i. This relay is ope 'atrd l llll' alternating current generated fromthe generator (i at the Pxrhange station E. that is, it is S'Il -lil\'('to alternating current ol :1 low l'ri-qlu-uor and iuei'l'oe-tivv todim-t rum-rut. in the diagram (Fig. l). thegenerator (i is roman-ted tothe line h v means of tluplug and socket and the operating oi theringing key K'. as is usual. From the key h. tlucircuit may he ravedthrough the conductor 2H4 to tin generator (l. the (olillilrtnr ZUIL theground y]. the ground 1/. the rondensrr 1/. the condlu-tor 300. therelay r. and the conductor 5 to tluline L. The ruorgrization of thisrelay closes the following rircuil to the call-up alarm 81. to-wit :4herontarl 2%. the ronductors i201 and 8:2. the valluip alarm 81, thecondurtor 66. the battery i the condor-tor 2 2. and the armature r" ofthe relay r. Conseqlicutlv all of the suhsiirtions are notifiedsimultaneously that the exchange station is calling. and the (XLll\l1;operator can then give all substations the same message. which incountry or outlying districts is desirable in cases of fires. floods.general inforn'iation. and weather reports In Fig. (3, is shown anadaptation of the prvsout invention to a common hatter systonn theenergy for opc'ating the various vlrrtmmagnots and relays and otherparts oi the instruments at the substations lu-inn' the same except thatfor operating the elm troniaguet 29, and lhurela) r. This main currentis derived iron the hatterv ll" at the exchange station vI; Theinsertion of the jar-k plug in the socket does not rut oil the hatterv Bfrom the line. hut nun-vi)" short circuits the drop signal ll. Theenergy is made available at the receiver hook .is la-l'ore set forth,hut in this (-aso through the fpllowinn t-haunt the battery I}. tho('(m' durtor 10" the contacts 2(l!l-----2lll, tho vondurtors l0 andfilii-tl rrontarls 219 1} of the socket J. the ronrluctor 15. the linoL;

or from the conductor 15 to the conductor" 2 the rhokr ooil r 5 theconduetor Li-ll. lln ((lllllllt'hill' 10."). the contarts llr ll, thecoudurtor 24 todhe line L, to tho substation 5. the rondurtor 7.theelectrolnagnet 21'. the conductors 5 and ti. and the hook 25'. llrrrit is made available to any of the rirruits. as for example the talkingcircuit. to-wit the rout-act (31, the conductors it: and T1 thetransmitter T. the conductor (37. the pi iinar o? the induction coil 68the 'olu uotor 19, the contacts Til- 71. the rondwtors 5i and Bil, thechoke coil a the ground 1, thr ground I; at the exchange station tlw(llil'ligt coil 5, the conductor 10', tlie rootn is eiver, a controllerfor the swim 212-4311, and the conductor 10'. Similarly it? and 205 areenergized, as is also the call-up alarm 81 and the signal lamp 1.61. Theactuation of the substation instrument, is in all respects identical tothe local buttery system before described in connection with Figs. 1through 5.

What is claimed, is

1. In a selective system of telephony, the combination with an exchangestation and a plurality of substations connected electrically for thetransmission of intelligence, of a call-up alarm at each substation, aselecting ('ltfi'ltr. at the exchange station, and two mechanisms at thesubstation and under the influence of the selectin device at the exchange ation, whereby one call-up alarm is operated or all are operatedsimultaneously.

2. In a selective system of telephony, the combination with on exchangestation. and a plurality of substations connected cleclrh rally for thetransn'iission of intelligence, Said exchange station being providedevith a selecting device and each substation bring provided with areceiver and a receiver hook, of a call-up alarm at each substation. andtwo mechanisms at each suhstetion and under the influence of theselecting device zit. the exchange whereby the call-up alarm at any oneof the substations may be operated regardless of the relative positionsof the receiver and receiver hook, or whereby all of the call-up alarmsin all substations may be operated simultaneously.

3. In a selective system of telephony, the combination with an exchangestation and a plurality of substations connected electli 2 ll) for thetransmission of intelligence. f a selecting device at the exchangstation, a call-up alarm at each substation, and two mechanisms underthe control of the select ing dcrice whereby all. call-up alarms cull beoperated simultanetnlsly, or one at a time.

:l. lo a selective s; sl'rlu of telephony. thrcoinbination with anexcliange'station and a plurality oi substations connected eleo tricallyfor the transmission of intelligence, of a. selecting device at theexchange station, a rotary controller at each substation and influencedonly by the selecting device, and means for holding each controller ininitial or zero position during the returning of the controllers to suchposition should such controller get out of nchronisiu.

5. In a selective system of telephony, the combination with an exchangestation and a plurality of substations connected clec tricall for thetransmission of intelligence, of a selecting; device at the exchange station, a receii'cr in each substation. a switch controlled shuntconnection. ac the re under the lfifllllil'lt'u ofthe selecting; delice, a calLup alarm in each substation, a circuit including a source ofelectrical energy; the call-up alarm, and two switches, one of theswitches being controlled by the controller to individuelly close thecall-up alarm circuit. and the other switch being controlled from theexchange station and simultaneously closed in all substations toenergize all call' up alarms in the system simultaneously.

6. In a selective system of telephony, the combination with an exchangestation and a plurality of sub-stations connected elcctricall r for thetransmission of intelligence. of a selecting device at theexchengestation, a receiver in each sub-station, a switch controlled shuntconnection across the receiver, an electrically actuated rotarycontroller for opening and closing the shunt switch, a call-- up alarmin each sub-station, a circuit including a. source of electrical energy,the call-up alarm and two switches at each substation, one of theswitches being closed by its controller when the shunt switch is opened,and an electrical device in each substation operative simultaneouslywith the rotary controller whereby said. electrical device and therotary controller are operable from the exchange for actuating all ofthe aforementioned switches and whereby all of the call-up alarms may beenergized simultaneously.

7. In a selective system of telephony, the combination with an exchangestation and a plurality ot substations connected elcctricall for thetransmission of intelligent-c, of a selecting device at the exchangestation, a. receiver incach substation, a switch controlled'shumconnection across the re ceiver, a rotor; controller for the switch andunder the influence of the selecting device, and a call-up alarm circuitincludinga source of electrical energy, a switch and an alarm at thesubstation, the switch there oi being controlh-id by the shunt switchand the controller.

8. In a selective system of telephony, the combination with an exchangestation, and a plurality of substations connected. electrically for thetransmission of intelligence, of a selecting device at the exchangestation, a receiver, receiver hook and a shunt connection across thereceiver at each sub station, a controller for the shunt connection ateach. substation and. under the influence of the selecting device,whereby the shunt connection is opened and closed en tircly from theexchange station, a. call-up alarm in each substation, a circuitincluding the call-up alarm, two parallel connected switches, and asource of electrical encrm one of said switches being controlled by t 1controller and closed when the shunt switdh is opened, and meanscontrolled from the exchange elation for closing all of the otherswitches to energize all of the call-up alarms in the systemsimultaneousli 9. In a selective system of telephony, the combinationwith an exchange station and a pluralt v of substations connectedelectricaliy for the transmission of intelligence, of a selectin de iceat the exchange station, a receituer, a receiver hook and a switch con--trolled shunt connection across the receiver at eaQh substation, acall-up alarm circuit including a call-up alarm, a source of electricalenergy, and a switch at each substw tion, the latter switch beingcontrolled by the shunt switch and means in each sub station andcontrolled solely b? the select-- ing device for actuating the smutswitch.

10. In a selective system of telephonyythe combination with an exchangestation and a plurality of substations connected for the.

transmlssion of intelligence, of means lo-- cated at the exchangestation for causing intermittent impulses to flow through the line tothe substations, an clectromagneti rally operated step-by-stcp device ineach substation operated by such impulses, and means for insuring asynchronized position of the latter device when it reaches its initialposition.

ll. In a selective system of telephony, the combination with an exchangestation and a plurality of substations connected electrically for thetransmission of intelligence; of means located at the exchange station"for causing intermittent ilnpulsrs to flow through the line to thesubstations; an elertrmnagnetically operated step-by-ston device in eachsubstation operated by such impulses; a callup alarm circuit at eachsubstation smd'including a source of electrical energy a switclu and analarm, said switch being opened and closed by the st'ep-by-step device;and an auxiliary circuit including said alarm and a source of electricalenergy at the exchange; whereby all of the call-lip alarms may beenergized simultaneously or separately.

1'2. A substation for a selective telephone system. including anelectrmmagnetically operated ste -by-step device a shunt switchcontrolled t ereby; a call-up alarm circuit, having a source ofelectrical energy, a switch controlled by the shunt switch, and analarm; an electrically actuated switch operative to a current of a.dificrent characteris tic than the step-bystep device; and a art-iuicircuit controlled thereby and inclu ing the alarm.

13. A. lock-out and shunt cor rolle fbr M- sclcctivc telephone system,including act-epby-step actuated disk having a plurality of peripheralgrooves and ridges, said grooves rality of ridges providing twocircumferene tial grooves one of greater depth than the other, twores1l1ent switch members, one of which is provided with a pin fordisposition.

in one of the grooves at a tim e,said grooves being in comnrunioationwith each other at predetermined intervals, a swinging support carryingboth switch members and mounted to more the switch members 1011-gitudinally of the disk, a spring for holding the support in onedirection and to hold the pin against one of the ridges of the disk at atime, and an electric motor for swinging the support in opposition tothe spring.

In testimony wherpof'I nfiix my signature in presence of two witnesses.

RUBEN C. M. HASTINGS.

Witnesses: DAVID P. Moons, M. E. ANDREWS.

